NEET often asks about Body Fluids and Circulation topics like ECG waves (P-wave = atrial depolarisation, QRS = ventricular depolarisation). Questions on blood groups (e.g., the AB group has no antibodies) and clotting (thrombin converts fibrinogen to fibrin) are common. Clinical questions on heart valves, cardiac output, and SA node conduction also appear frequently. RBCs lacking a nucleus and platelet-related clotting disorders are also asked. Focus on these high-yield concepts for NEET prep.